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Set of shims to replace lost Model Yew parts. (Please ignore incorrect photo.)

Large shim is 31.8 mm diameter (the same as the wider part of your bars near the stem). Wide shim is 22.2 mm diameter (the same as the narrow part of your bars near the grips).

Use the wide shim for mounting your bell securely near your grips, closer to your hands. Use the thin shim for mounting your bell securely near your stem.